Don't try to compile platform libraries with the new backend.

pkg/compiler/lib/src/js_backend/codegen/task.dart

Index: pkg/compiler/lib/src/js_backend/codegen/task.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/task.dart b/pkg/compiler/lib/src/js_backend/codegen/task.dart
index 8345894e97778b1f5f02be77010bffb511661e18..9288e742392bd5113d06f0dee117267bfc79d974 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/task.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/task.dart
@@ -64,6 +64,10 @@ class CspFunctionCompiler implements FunctionCompiler {
     types = new TypeMaskSystem(compiler);
     AstElement element = work.element;
     return compiler.withCurrentElement(element, () {
+      if (element.library.isPlatformLibrary) {
+        compiler.log('Using SSA compiler for platform element $element');
+        return fallbackCompiler.compile(work);
+      }
       try {
         if (tracer != null) {
           tracer.traceCompilation(element.name, null);
@@ -74,15 +78,9 @@ class CspFunctionCompiler implements FunctionCompiler {
         treeFunction = optimizeTreeIR(treeFunction);
         return compileToJavaScript(work, treeFunction);
       } on CodegenBailout catch (e) {
-        if (element.library.isPlatformLibrary) {
-          compiler.log('Falling back to SSA compiler for $element'
-              ' (${e.message})');
-          return fallbackCompiler.compile(work);
-        } else {
-          String message = "Unable to compile $element with the new compiler.\n"
-              "  Reason: ${e.message}";
-          compiler.internalError(element, message);
-        }
+        String message = "Unable to compile $element with the new compiler.\n"
+            "  Reason: ${e.message}";
+        compiler.internalError(element, message);
       }
     });
   }